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philcobill · 08-16-2021, 08:21 AM

We are considering getting a high compression (actually more of a medium compression) head to replace the aluminum head on our Model A's engine. Specifically I have my eye on the 5.5. to 1 ratio head offered by some of the on-line model a stores. I assume that the aluminum head already on the engine is high compression. (we measured the compressions on each cylinder and they were around 75 psi each.) Should I be able to just simply replace the head or are there other considerations that would need to be done with the other internal engine parts, given that it already had a high compression head? If we do this we will get the higher quality studs etc. What about a gasket? What is recommended? I think that Snyders had one they recommend.

If we went up to a 6.0 to 1 ratio head is that a game changer?

Bill
Walworth, New York

08-16-2021, 08:21 AM	#1
philcobill Senior Member Join Date: Jul 2021 Location: Walworth, New York Posts: 138	High Compression Head Replacement We are considering getting a high compression (actually more of a medium compression) head to replace the aluminum head on our Model A's engine. Specifically I have my eye on the 5.5. to 1 ratio head offered by some of the on-line model a stores. I assume that the aluminum head already on the engine is high compression. (we measured the compressions on each cylinder and they were around 75 psi each.) Should I be able to just simply replace the head or are there other considerations that would need to be done with the other internal engine parts, given that it already had a high compression head? If we do this we will get the higher quality studs etc. What about a gasket? What is recommended? I think that Snyders had one they recommend. If we went up to a 6.0 to 1 ratio head is that a game changer? Bill Walworth, New York Last edited by philcobill; 08-17-2021 at 11:48 AM.